CreateQuery t2 (children 3)
 Identifier t2
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType Int32
   ColumnDeclaration pe (children 1)
    DataType Map (children 1)
     ExpressionList (children 2)
      DataType String
      DataType Tuple (children 1)
       ExpressionList (children 2)
        NameTypePair a (children 1)
         DataType UInt64
        NameTypePair b (children 1)
         DataType UInt64
 Storage definition (children 2)
  Function MergeTree
  Identifier id
